(b)  
Slide the Section 4 up through the slot in the bottom of the waveguide switch support.

 (c)  
Install four screws and lockwashers with gasket in the section 4 flange that mates with the waveguide switch.

 NOTE: The screws go through the holes in the waveguide switch
____
 support bracket into the waveguide switch.
 (d)  Install four screws and lockwashers with gaskets in flanges between section 3 and section 4.
 G. R/T Feeder Waveguide Section Installation
 NOTE: To remove one or both R/T feeder sections, it is necessary
____ to get into the nose radome and below the compartment floor in the nose cargo door.
 S 864-095
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7 WXR L RT
 2) 7C19 WXR R RT

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747-400 MAINTENANCE MANUAL
 S 014-246
 (2) Get access to the R/T feeder waveguide below the compartment floor:
 WARNING: STEP ONLY ON THE FLOOR BEAMS WHEN YOU REMOVE CARGO FLOOR
_______ PANEL. THE FLOOR PANELS BETWEEN THE BEAMS CAN FLEX AND CAUSE YOU TO FALL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL AND/OR DAMAGE TO THE WEATHER RADAR EQUIPMENT OR BLANKET MATERIAL CAN OCCUR.
 WARNING:_______THE CARGO FLOOR PANEL IS HEAVY. TO PREVENT INJURY, TWO PEOPLE ARE REQUIRED WHEN LIFTING OR MOVING THE CARGO FLOOR PANEL.
 CAUTION: DO NOT PUSH OR PULL THE CARGO FLOOR PANEL ACROSS THE FLOOR
_______ BEAMS. THIS ACTION CAN CAUSE DAMAGE TO THE BLANKET MATERIAL.
 (a)  Carefully remove the cargo floor panel.
 S 424-097
 (3)  Install the R/T feeder waveguide section:
 (a)  
Hold the R/T feeder waveguide section.

 (b)  
Install the screws and washers with a gasket between the R/T feeder flange and the waveguide switch port.

 (c)  
Install the screws and washers with gasket between the flanges on the R/T mount waveguide and the R/T feeder waveguide.

 H. Weather Radar System Test
 S 864-098
 (1) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C7 WXR L RT
 2) 7C19 WXR R RT

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 (2)  S 864-099Supply electrical power (AMM 24-22-00/201).
 (3)  S 734-100Do the ND display test in the system test (AMM 34-43-00/501).
 (4)  S 414-104PASSENGER AIRPLANES; Close access door 117AL to the electronic compartment if access is not necessary (AMM 06-09-01/201).
 (5)  S 014-247Install the cargo floor panel on the floor beams above the receiver/transmitters.
 WARNING:_______ STEP ONLY ON THE FLOOR BEAMS WHEN YOU INSTALL CARGO FLOOR PANEL. THE FLOOR PANELS BETWEEN THE BEAMS CAN FLEX AND CAUSE YOU TO FALL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL AND/OR DAMAGE TO THE WEATHER RADAR EQUIPMENT OR BLANKET MATERIAL CAN OCCUR.
 WARNING:_______ THE CARGO FLOOR PANEL IS HEAVY. TO PREVENT INJURY, TWO PEOPLE ARE REQUIRED WHEN LIFTING OR MOVING THE CARGO FLOOR PANEL.
 CAUTION:_______ DO NOT PUSH OR PULL THE CARGO FLOOR PANEL ACROSS THE FLOOR BEAMS. THIS ACTION CAN CAUSE DAMAGE TO THE BLANKET MATERIAL.
 (a) (b)  Carefully install the cargo floor panel.Tighten the 18 fasteners that hold the cargo floor panel.
 (6)  S 864-105Remove electrical power if it is not necessary (AMM 24-22-00/201).

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